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a)1800-4%=1800-4/100*1800=1800-72=1728zł
b)x-4%=1200
x-0,04x=1200
0,96x=1200 /:0,96
x=1250zł
zad2
5(3 - x) = 2(2x +9) + 2x – 5
15-5x=4x+18+2x-5
-5x-6x=13-15
-11x=-2 /:(-11)
x=2/11
b)(2x - 3)2 = 4x2 – 3
4x²-12x+9=4x²-3
-12x=-3-9
-12x=-12 /:(-12)
x=1
96%-x
172800+100x/:100
1728=x
x=1728
b)x-0,04x=1200
0,96=1200/:o,96
x=1250
zad2 a)5(3-x)=2(2x+9)+2x-5
15-5x=4x+18+2x-5
-5x-4x-2x=18-5-15
-11x=-2/:(-11)
x=2/11